51092981 has 8 divisors (see below), whose sum is σ = 51607224. Its totient is φ = 50581440.

The previous prime is 51092953. The next prime is 51092999. The reversal of 51092981 is 18929015.

It can be written as a sum of positive squares in 4 ways, for example, as 5597956 + 45495025 = 2366^2 + 6745^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51092981 is a prime.

It is a super-2 number, since 2×51092981² = 5220985414932722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51092941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65711 + ... + 66483.

It is an arithmetic number, because the mean of its divisors is an integer number (6450903).

Almost surely, 2^51092981 is an apocalyptic number.

It is an amenable number.

51092981 is a deficient number, since it is larger than the sum of its proper divisors (514243).

51092981 is a wasteful number, since it uses less digits than its factorization.

51092981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 51092981 is about 7147.9354361941. The cubic root of 51092981 is about 371.0682084107.

The spelling of 51092981 in words is "fifty-one million, ninety-two thousand, nine hundred eighty-one".